Coal dust feeder foe fuenaces



(No Model.) 2 Sheets-Sheet 1.

A. FRIEDEBERG.

GOAL DUST FEEDER FOR FURNACES. No. 537,108. Patented Apr. 9, 1895.

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(No Model.) 2 sheets-sheet 2. I A. FRIEDEBERG.

GOAL DUST FEEDER FOR FURNACES.

N0. 537,108. I Patented'Apr. 9, 1895,

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ALFRED FRIEDEBERG, or BERLIN, GERMANY.

COAL-DUST FEEDER FOR FURNACES.

SPECIFICATION forming partof Letters Patent N0. 537,108, dated April 9, 1895.

Application filed August 9, 1894- Serial No. 519,858- (ll'o model.) I

To all whom it may concern:

Be it known that I, ALFRED FBIEDEBERG, a

subject of the King of Prussia, German EH1,

peror, and a resident of Berlin, in the Kingdom of Prussia, German Empire, have invented an ImprovedOoal-Dust Feeder for Furnaces, of,

which the following is an exact specification.

This invention relates to a device for feeding furnaces, especially boiler-furnaces, with coal-dust, and consists in certain arrangements and combinations of parts which will be more fully described hereinafter.

In order to make my invention more clear, I

refer to the accompanying drawings, in which similar letters denote similar parts throughout the several views, and in which- Figure 1 shows a front view of my improved feeding-device, partly in section.

is a detail, shown in vertical section.

The construction is as follows: Several:

terminate into said boxes b in such a direction, that the cone of spread is resulting from the function of the nozzles enters the vessel at below that side-wall of each of the. boxes b which is situated opposite to the side-wall of vessel a. Outlet-pipes c communicating at their outer ends with a stand-pipe orj's'tandpipes g extend from the side-walls of the boxes Said stand-pipe is held in a vertical position by a bracket 1 and is provided near its bottom with an opening it, and with a slide I or flap 1. adapted to close said opening.

Concerning the stand-pipe g,it is of importance that the exit, or delivery-end respectively, of the same is situated above, orhigher than, the inlets of the pipes a into said standpipe. The latter is furnished at its head with a hopper-like body wt arranged horizontally, and containing or embracing respectively, an other hollow or solid body a of similar configuration. The respective size of the two Fig. 2 is an upper view, also partly in section; and Fig. 3

'tube q is provided with an opening a" coinciding with opening 3 of pipe d when the appa-- rat'us is in its proper working position. Tube q is then in communication with pipe d. Said communication will be interrupted as soon as the whole apparatus is turned around tube q, as opening 8 of pipe d'will be-closed then by the wall of said tube q.

The whole apparatus is arranged in front of a furnace (especially a boiler-furnace, as indicated for instance at R in Figs. 2 and 3) in such a manner, that if the apparatus is in working position, the flange of body m lies close to the opening of, or entrance to, the

furnace. As long as the apparatus is in this position, tube q and pipe-d are communicating, and a blast of air pressed into tube g by any suitable means is allowed to enter the boxes I).

Vessel a. as well as hopper a forms the storeroom for the coal dust to be dispersed. The material is introduced into vessel (1. through the hopper, and is filling said vessel up to the lower edge of the sidewalls of the boxes I). By said walls the coal-dust is hindered from entering the interior of said boxes I). There is remaining, thus, a space between the surface of the coal-dust and the covers, or bottoms respectively, of said boxes. It, now, valve '0 is opened, the blast coming from tube q will flow through the nozzles e into the boxes. The blast pushing upon the surface of the coal-dust causes the latter to be Whirled up, and is driving the particles loosened by its action into the channels a. By reason of the peculiar arrangement of the nozzles, or by the direction given the blast by said arrangement respectively, there is whirled off that portion of the coal-dust which is indicated by k in Fig. 1. Thus, the other portion of the coal- ICU dust supported up to then by said portion it will lose its support, and will fall down into the space emptied by the action of the blast. According to the quantity falling down into vessel a out of hopper a, fresh material is automatically introduced into the latter by means of any suitable contrivance. There is, consequently, a steady delivery of coal-dust to the furnace as long as the blast is allowed to enter the boxes I). The particles whirled off by the blast are carried away by the latter through the stand-pipe g. By reason of the vertical position of said stand-pipe, and by the upward direction imparted thereby to the blast as well as to said particles, all larger or heavier parts, as pieces of coal and slag, are caused to fall down, and to collect on the bottom of the stand-pipe. Said parts may be removed now and then by aid of opening h aforementioned. The mixture of coal-dust and air when pushing upon the body it is deviated by the latter, and caused to enter the annular channel 0. By reason of theconaxial arrangement of the two bodies on and n, and by the equal width of said channel 0, the mixture is equally distributed within the channel, entering in this state the furnace R.

In order to cleanse the furnace, and to remove residues of the fuel, the feeding-apparatus must be swung off the furnace. This is performed by turning the apparatus around tube q. The blast is automatically interrupted thereby, as openingsof pipedis closed by the wall of tube q. The feeding of the material, consequently, ceases, and will commence again as soon as the apparatus is swung back into its former, proper working position.

Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States is 1. In a coal-dust feeding-device for furnaces: the combination with a vessel (1 adapted to receive the material to be dispersed, of one or more boxes 1) arranged in an inverted position within the upper portion of said vessel, and forming the cover of the latter; a hopper a arranged between said boxes, and adapted to receive the feed-material for the said vessel a; blast nozzles 6 arranged at the side of said hopper, and terminating into the topplates of the said boxes I), the outer portion of said nozzles being inclined, substantially as shown and for the purpose as described.

2. In a coal-dust feedingdevice for furnaces, the combination with a vessel a adapted to receive the material to be dispersed, of one or more boxes 17 arranged in an inverted position within the upper portion of said vessel, and forming the cover of the latter; ahopper a arranged between said boxes and adapted to receive the feed-material for the said vessel a; a feed-pipe g connected at its lower end with pipes 0 extending from the said boxes I), and at its upper end with the furnace; said pipes c and 9 being adapted to convey the coal-dust whirled off by the blast to said furnace, substantially as described.

3. In a coal-dust feeding-device for furnaces, the combination with a vessel aadapted to receive the material to be dispersed, of one or more boxes 1) arranged in an inverted position within the upper portion of said vessel, and forming the cover of the latter; a hopper a arranged between said boxes, and adapted to receive the feed-material for the said vessel a; a stand-pipe g connected at its lower end with pipes at extending from the said boxes 5, and carrying at its upper end a hollow body wt containing another body a adapted to form with body an an annular channel 0; said pipes c and g, as well as said channel 0 being adapted to convey the coal-dust whirled off by the blast to said furnace, substantially as described.

4. In a coal-dust feeding-device for furnaces, the combination with a vessel (1 adapted to receive the material to'be dispersed, of one or more boxes 1) arranged in an inverted position within the upper portion of said vessel and forming the cover of the latter; a hopper 0/ arranged between said boxes and adapted to receive the feed material for the said vessel a; blast-nozzles 6 arranged in the topplates of the said boxes b; a vertical tube Q2 adapted to be turned upon a stationary tube q, and connected at its lower end with the bottom-plate 23 supporting the saidvessel a, and at its upper end with the nozzles e by a pipe (1; said pipe q having a side-opening 7 coin municating with said pipe cl when the latter is in its working-position, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ALFRED FRIEDEBERG.

Witnesses:

CHAS. II. DAY, NV. HAUPT. 

